Chapter 2 of the Oklahoma adopted IPC® 2018 is adopted with the following modification: The definition of a BUILDING DRAIN has been modified to align with the industry standard where the site sewer (civil) picks up 5 feet outside of the building. This definition has been modified to read: BUILDING DRAIN. That part of the lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside and that extends 5 feet (1524 mm) in developed length of pipe beyond the exterior walls of the building and conveys the drainage to the building sewer.
Okla. Admin. Code § 748:20-16-7